When to Plant Vegetables in Hawaii
Tropical Climate (Zones 10+)Zones 12a
Hawaii’s tropical climate provides nearly year-round growing conditions, though the intense summer heat and humidity require careful variety selection. The primary vegetable season runs from September through March when temperatures are more moderate. Heat-tolerant crops like sweet potatoes, okra, and tropical peppers handle summer conditions, while most other vegetables perform best during the cooler months.
What to Plant This Month in Hawaii (May)
Direct Sow
- bean
- corn
- sweetPotato
Transplant Outdoors
- pepper
- eggplant
Harvest
- tomato
- pepper
- eggplant
- cucumber
- zucchini
- bean
- corn
- basil
- sweetPotato
May Garden Tasks
- • Wet season approaching — prepare drainage and raised beds
- • Harvest heat-stressed tomatoes and cucumbers
- • Plant heat-tolerant varieties: sweet potato, pepper, eggplant
- • Reduce nitrogen fertilizer as wet season nears (prevents lush disease-prone growth)
- • Apply preventive fungicide for incoming humid conditions
- • Check irrigation systems before heavy rains arrive
Top Vegetables for Hawaii
Tomato
fruitmoderate60-85 days
Yield: 10-15 lbs per plant
Pepper
fruiteasy70-90 days
Yield: 5-10 peppers per plant
Sweet Potato
rooteasy90-120 days
Yield: 4-10 lbs per plant
Basil
herbeasy24-28 days to first harvest
Yield: 1/2-1 cup fresh leaves per week per plant
Green Bean
legumeeasy50-65 days
Yield: 1/2 lb per plant per picking
Cucumber
vineeasy50-70 days
Yield: 10-20 cucumbers per plant
Hawaii Cities
Frequently Asked Questions
- When should I start planting vegetables in Hawaii?
- Hawaii’s tropical climate allows year-round vegetable gardening. The primary planting seasons are fall through spring (September–March) when temperatures are cooler and humidity is lower. Summer heat and heavy rains make it challenging to grow many crops, though heat-loving vegetables like okra, sweet potatoes, and southern peas thrive.
- What are the best vegetables to grow in Hawaii?
- Based on Hawaii’s Tropical Climate (Zones 10+) conditions, the best vegetables include Tomato, Pepper, Sweet Potato, Basil. These varieties are well-suited to the growing season length and temperature patterns found across Hawaii’s USDA zones (12a). Choose short-season varieties if you are in a colder part of the state and long-season varieties in warmer areas.
- What USDA hardiness zones are in Hawaii?
- Hawaii spans USDA hardiness zones 12a. Your zone determines your average last spring frost date and first fall frost date, which together define your growing season length. Use our city guides below for zone-specific planting calendars tailored to your exact location.
- What vegetables can I plant in Hawaii right now?
- In May, Hawaii gardeners can direct-sow bean, corn, sweetPotato. Transplant pepper, eggplant outdoors. Check your specific city guide for exact timing based on your local frost dates.
- What are common vegetable gardening mistakes in Hawaii?
- Trying to grow cool-season crops during the hot wet season: Reserve lettuce, spinach, broccoli, and peas for the dry winter months (November-February) when temperatures are cooler. Use shade cloth and raised beds during transitional months. Not managing heavy tropical rains and soil drainage: Use raised beds with excellent drainage, and amend soil heavily with compost. Mulch prevents rain from compacting soil and splashing disease onto leaves. Consider covered growing areas during peak wet season. Ignoring tropical-specific pest and disease pressure: Nematodes, whiteflies, and fungal diseases thrive year-round in tropical heat and humidity. Practice strict crop rotation, use nematode-resistant varieties, and apply neem oil preventively.